I have sold a couple I regret, one was Williams IJ, and the other was BDK. I sold them to find nicer examples, but did not realize I would get distracted by other titles first and they would take a seat on the sidelines. Waiting for a deal to pop up, but missing them at the same time. Meanwhile new titles are popping up like Houdini, very tempting to ditch the thought of obtaining one's you already owned before to get the new and shiny one. This hobby is a disease sometimes. You always are interested in something new and sometimes you give up on a machine you really like-only to find out buying new does not always lead to the same level of satisfaction.